Sand-blast machine



W. H. AND G. W. LEIMAN.

Patented Aug. 19, 1919.

THE COLUMBIA PLANQGRAPI! 60., WASHINGTON, D. c.

V UNITED STATES. AT N OFFIC .WILLIAM HENRY LEIIVLAN AND GEORGE WILLIAMQLEIMAN, .or NEWARK, :NEW JEnsEY.

' sANn-BtAsr'M'AcEmEf To all whom it may coacern Be it known that we, WVILLIAM H. LEIMAN and GEORGE W. LEIMAN, citizens of the United States, and residents of Newark, in the county of Essex and State of New Jersey, have invented a new and useful Improvement in Sand-Blast Machines, of which the following is a specification.

Our invention comprises certain improvements in sand blast machines of the type disclosed in our United States Letters Patent No. 807036 dated December 12, 1905; whereby the sand feed is manually controlled in an easy and eificient manner, thus per mitting the sand to be fed only when needed. This will reduce the wear on the machine, the amount of dust within the machine, the sand consumption and the power required for running the machine.

Our invention more particularly comprises a normally open foot controlled b-y pass valve for the air supply pipe, a sand pipe housed entirely within the casing and having no sharp bends therein, an adjustable, removable bottom section of the sand pipe, and a door for the sand receptacle at the bottom of the casing.

A practical embodiment of our invention is represented in the accompanying drawings, in which,

Figure 1 is a vertical central section through our improved sand blast machine, the by-pass valve being shown open in full lines and closed in dotted lines, and

Fig. 2 is an enlarged detail vertical central section through the by-pass valve for the air supply pipe.

The machine casing 1 is supported upon legs 2 and is provided at its bottom withthe sand receptacle 3. A door 4 is provided in the side of the sand rece tacle 3 for gaining access to the same. The sand pipe 5 is housed entirely within the casing 1. The bottom section 6 of the sand pipe is adjustable and removable. Set screws 7 are provided for this purpose, access to which set screws may be readily obtained by opening the door a of the sand receptacle;

The upper section 8 of the sand pipe leads into a mixing chamber 9 having a contracted lower portion 10 from which the sand ejecting spout or nozzle 11 projects. An air jet tube 12 extends downwardly into the mixing chamber and terminates a short distance above the top of the ejecting nozzle 11. The air supply pipe 13 leads from a suitable Specification of Letters latent, "Patented Aug. 19, 1919. Application filed April 17, i517. saai'm16a 1a1 source'of air pressure, not shown, to the ejectingnozzle 1 2. The sand ejecting and lifting pipe 14 leads from the air supply pipe 1 1 along the exterior of the casing 1, into the bottom of the sand receptacle 3. This pipe 1a is provided with a suitable cock 15 for regulating the amount of air passing therethrough into the sand receptacle.

The air supply pipe 13 is provided with a by-pass port 16 open to external atmosphere. A normally open foot controlled by pass valve 17 is arranged in position to close the port 16. The valve 17 is mounted for a limited universal movement on the adjusting nut 18 of the valve stem 19 so as to securely seat on the port 16 when closed, the

adjusting nut-18 serving to accurately determine the position of the valve with reuse, the air escapes through the by-pass port 16. After the operator has placed the the foot lever and thus closing the port 16 by the valve 17. As soon as he is through article to be blasted in position he may start the machine in operation by depressing with the sand blasting operation, the operation of the machine is stopped by merely releasing the foot lever.

It is evident that various changes may be resorted to in the construction, form and arrangement of the several parts without departing from the spirit and v scope of our invention and hence we do not wish to limit ourselves strictly to the structure herein forth, but

What we claim is:

1. In a sand blast machine, a casing provided at its bottom with a sand receptacle, a mixing chamber within the casing having a downwardly directed ejecting nozzle, a sand pipe housed entirely within the casing, leading firom the said receptacle to the mixing chamber, an air supply pipe leading to the mixing chamber, a sand ejecting and lifting plpe leading from the air supply pipe along the exterior of the casing and into the bottom of the sand receptacle, said air supply pipe having a by-pass port, a normally open exterior valve therefor having its stein slidable in suitable guides on the sand ejecting and lifting pipe and a foot lever connected to said stem for closing said valve;

2. In a sand blast machine, a casing having therein a sand receptacle and a mixing chamber, an air supply pipe leading to the mixing chamber, a sand pipe leading from 10 the sand receptacle to the mixing chamber,

In testimony, that We claim the foregoing 15 as our invention, We have signed our names this 10th day of April, 1917.

WILLIAM HENRY LEIMAN. GEORGE WILLIAM LEIMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

